While rain delays are common, the event has only been canceled a handful of times, such as during the two World Wars and an outbreak of Yellow Fever in the 1870s, according to Double-Barrelled Travel. In the greater New Orleans area in 2021, parades have been canceled due to the Covid-19 pandemic (but the heart of the holiday, king cakes, and music, will still go on). To find out what activities are being practiced safely in 2021, click here.